Collective spin modes in Fermi liquids with spin-orbit coupling

TL;DR

This paper reviews recent theoretical and experimental advances in understanding collective spin modes in Fermi liquids with spin-orbit coupling across various two-dimensional and topological systems.

Contribution

It provides a comprehensive overview of the emergence and observation of spin oscillation modes induced by spin-orbit interaction in different material systems.

Findings

Identification of new collective spin modes in Fermi liquids with spin-orbit coupling

Experimental evidence of these modes in 2D electron gases and topological insulators

Insights into the role of spin-orbit coupling in magnetization dynamics

Abstract

A combination of spin-orbit coupling and electron-electron interaction gives rise to a new type of collective spin modes, which correspond to oscillations of magnetization even in the absence of the external magnetic field. We review recent progress in theoretical understanding and experimental observation of such modes, focusing on three examples of real-life systems: a two-dimensional electron gas with Rashba and/or Dresselhaus spin-orbit coupling, graphene with proximity-induced spin-orbit coupling, and the Dirac state on the surface of a three-dimensional topological insulator. This paper is dedicated to the 95th birthday of Professor Emmanuel I. Rashba.